多功能车辆总线(MVB)是列车上通用的内部通信网络总线，对实时性有较高要求。通过分析 MVB非周期信息的通信机制和调度策略，针对非周期信息存在仲裁延时的状况，提出了一种新的非周期信息调度策略，避免了仲裁过程。并将设备优先级加入信息模型中，保证紧急非周期信息的优先发送。案例仿真计算分析表明，所提调度策略能有效提高网络总线的实时性，在不同设备数的条件下优势明显。与其他方法比较，在同设备多待发信息的情况下可以有效减小信息的最大响应时间，保证非周期信息的实时性。%Multifunction vehicle bus (MVB)is universal internal communication network bus on the train with a higher real-time requirement.By analyzing the communication mechanisms and scheduling policies of MVB aperiodic information,it is found that there exists an arbitration delay in the aperiodic information.To avoid the arbitration process, a new aperiodic information scheduling policy is proposed.And device priority is added to information model to ensure the sending priority of urgent aperiodic information.Through the case simulation analyses,it is proved that the proposed scheduling policy can improve the real-time of network bus,and under the conditions of different number of devices,the advantages are obvious.Compared to other methods with multiple outgoing information existing in the same device, this method can effectively reduce the maximum response time of information to ensure real-time of aperiodic information.
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